Ron Brand

Russell Brand's father isn't buying his son's rape conviction ... suggesting the jury that sent the disgraced comedian to prison for more than a decade could have been corrupt. Brand's dad, Ron Brand, went off on reporters outside a London courthouse Monday after Russell was sentenced to 10 years…

Russell Brand was escorted by police into a UK courtroom to be sentenced Monday after being convicted of rape and sexual assault ... but the British actor seemed much more concerned about the welfare of his wife. Two officers escorted Brand -- clad in a tweed suit and white shirt -- into Courtroom…